Valve tappet



.lilly 8, 192.4`

J. E. FOSS VALVE TAPPET Filed June 14. 1922 II lill:

Patented .hay s, '192e UNITED STATES yPAT-ENTr OFFICE.l

VALVE TAPPET.

Application filed .Tune 14, 1922. Serial No. 568,313.

To all whom t may concern:

Be it known that' I, JOSEPH EUGENE Foss, acitizen of the United States, residing at Florence, inthe county of Florence and State of South Carolina, have invented certain new and useful Improvements in Valve Tappets, of which the following is a speciiication, reference being hadto the accompanying drawings.

This invention relates to valve tappets, and morefparticularly to an improvement in the construction ofthe valve tappets of internal combustion engines.

An important object of the invention is toprovi'de a valve tappet which will be silent vin its operationk and eliminate the clicking noise occurring when the tappets have become slightly worn.

` -A further object ofthe invention is to i the tappet assembly.V

provide for proper lubrication ofthe valve tappet at its working engagement with its guiding sleeve. i

A still further object of the invention is to provide a device of this character which may bereadily constructed and assembled, whichlprovides a maximum of adjustability and which may be-employed or substituted for valve tappets of .engines now in use.

Other objects and advantages of the invention will become apparent throughout the coursev 'of the'following description.

In the'accompanying drawings wherein c for the purpose of illustration is-shown a preferred embodiment of my invention and wherein like reference characters designate like parts throughout, I Y c Y Figure 1 is a sectional view taken through an engine'showing a tappet assembly con- 'structed in iaccordance with my invention;

and y* Y Figure 2 is asectional view taken through Referring now more particularlyv to the drawings, the numerallO indicates agtubular; guiding shelladapted to be engaged` in aguide shell -opening'11 of an engine base 12.r` The shell'is provided adjacent its up'-` per end' with Yshoulders 13 adapted to Vabut the engine base and be securedv thereto in any suitable manner, as indicated at 14, so

that" the shell may be securedagainst movement with relation to vthenengine base; The lowerY end of the shell is provided with a reduced axial outletopeningl Vpreferably Aformed ina depending sleeve 16, which re- Yduced outlet opening forms at the lower end of the shell interiorly thereof an upwardly directed shoulder 17, the purpose of which will hereinafter appear.

The numeral 18 indicates a valve tappet as a whole comprising upper and lower sec-V tions 19 and 20 connected by an enlarged collar 21, the periphery of which slidably embraces the inner face of the shell 10. The

' the tappetl 18 as provided with a key 24: en-

gaging in a key slot 25 formed in the depending sleeve 16. The lower face of the collar 21 forms Va downwardly directed shoulder 26 facing the shoulder 17 of the shell 10 andthese shoulders 17 and 26 are provided with grooves 27 receiving the ends of a coil`spring 28 surrounding the lower end 2O of the tappet 18 within the shell 10. The grooves 27 are provided to maintain the spring against side slip such as would bring it into engagement during its move ment either with the shell 10-or the tappet 18, since such engagement would cause a squeaking during the operation of the engine. Y c f Y -The upper end of the shell 10 is exteriorlyvscrew-threaded for engagement with a depending flange 29 formed upon a combined guide and capnut 30. This guide and capy nutis providedV with a central bore 31 receiving the upper end 19 of thertappet 18 and of slightlyV greater diameter than lthis upper end. It will be noted that the shell 10 has a two pointV engagement' withy the tappet 18 to maintain the same in alignment,'the same being provided in the bore 15, and the engagement ofl the collar 21 with the interior Vof the shell, andv accord# ingly a sliding iit between the upper end 19 Vof the tappet 18, and the guide and'cap nut 30 is unnecessary. Engagement ofthe upper end of the tappet 18 with thevalve c or push rod for thevalve may be of any desired type. In the present instance I have illustrated the tappet 18 as provided in the upper end 19 thereof'with an axial screw-threaded bore 32 adapted to receive a screw-threaded lower'end 33 of a push rod 84, the push rod being provided with the usual lock nut 35 whereby `it may be secured in adjusted position.

In practice the spring 2S will beimade of suflicient strength to elevate the working parts interposed between the cam 22 and the valve stem 36 of the valve which is to be operated. ln the present showing the spring 28 will be of suilicient strength to yelevate its tappet18, the push rod 34 and rocker arm 37' so as to maintain the valve 39 which will permit the passage to thel interior of the shell 10 of oil thrown from the felt washer 41 to the throws duri-ng their rotation` The uppermost opening 39 of the shelllis so arranged as to be disposed immediately below the metal of the engine base 12 at the sides ofthe opening 11 throughwhich the shell 10 extends. The collar 21 is so arranged upon the tappet 18 that in its normal or lowered position its upper ,face is immediately aligned with the lower edge of the upper opening 39 andV accordingly` oil thrown upon this collar fromthe crank throws will be spread upon the inner wall of the shell to lubricate the same. LOijl entering at the lower opening 39 will pass downwardly through the bore 15 and lubri' cate the engagement of the lower end of the tappet in this bore. Any excess oil collectingk in the'lower end of the shell will, of course, be drained back intothe crank base through the opening 3 9.` The bore 31 of the guide and` cap nut 30 is provided.' centrally with an f enlargement or groove 40 in which is disposed a felt washer 41. The upper end of vthis bore is preferably tapered so as toV form a tapered enlargement 42 between the upper end 19 of the tappet in which oil may be introduced to pass downwardly to the felt washer 41.'

Y This kwasher will constantly lubricate the upper end 19 of the tappet. Furthermore, oil will be thrown through the upper open-y ing 39 against the upper end 19 of the tappet and will be wiped off and collected `bv provide further lubrication.

From the foregoing it is believed to be obvious that a valve tappet constructed in accordance with my invention is particular-Y ly well adapted for the purpose for which it is intended in that it will preventY the clicking noises ordinarily occurring in the operation of the valves and in that it provides a structure readily assembled and which will be very durable in service. It is furthermore pointed out that the valve tappet 18 may be readily removed at any time yfor inspection or replacement without the necessity of removing the shell 10 from the engine. Many changes being possible in the shape, size and arrangement of the various parts hereinbefore set forth, I d onot limit myself to the' specific structure thereof except as hereinafter claimed.

1 claim y 1. A tappet. assembly for the valves of internal combustion engines embodying a tappet shell adapted to be" secured in the shell receiving opening offthe'base' of anv enf gine andv provided interiorly at` the lowerend thereof with an axial opening, andan upwardly directed'shoulder, a'tappet having its lower end slidably engage'd'in saidop'ening` and slida-bly engaging the interior" wall of the shell, a downwardly'directed shoulder formed on said tappet, and` aV compression spring disposed int'ermediate'the shoulders of the shelland tappet', the bore. oftheshe'll being unrestricted at its upper end to 'there'- by permit removal of the tappet fromftlie shell while the shell is4 in position in the' base of the engine. K y i 2. A tappet assembly for the valves of internal. combustion engines comprising lal tappet shell having its upper end open and its lower end provided witharestricted out.- let forming an.l upwardly directed shoulder within the shell, a., tappet slidably mounted. within ythe borev ofthe shelljremovablei from.A the, shell through vthe upper end ofthebojre'V thereof. and havingitsf` lower end extending through said reduced outlet. and having a) sliding t therein, a com'bined capi nut.' and: guide sleeve mounted uporr tlie'iipp'erl end of, said shell, a reduced upper end ons'aidtappet extending through, af borel formed in saidcap nut, said tappet embodyinga downs wardly directedshoulder opposing the up-` wardly directed Shoulder of the shell and" al compression spring disposed intermediate said shoulders y y Y j 3.111 atappetassemb1y for the valvesof internal combustion. engines, a. tappeti guide. shell having a central` bore andiA provided upon itsV exteriory with lnages whereby it may be attached to an engine basev at, the sides'of theg'tappet shellireeeifvingf opening, thereof, said shell being` providedat the`y` lower endthereof with a depending sleeve; having a reduced bore communicating witlt the bore ofy ,thevv shell and`combining,witlrthei shell to form an upwardlyd-irecte'd shoulder,

Y a tappet disposed withinvthe shell and-haw ing its lower end slidablyfdirectediimthrougli, and having' a splined engagement with said l sleeve, the lower face of said tappet forming a downwardly directed shoulder opposing the shoulder of the shell, grooves formed in said shoulders in spaced relation to the tappet and shell7 and a compression spring disposed within the shell surrounding the lower end of the tappetand having its ends seated in said grooves. Y

l. A tappet assembly for the valves of internal combustion engines comprising a Y tappet shell having its uppervend open and its lower end provided with a restricted outlet forming an upwarly directed shoulder within the shell, a tappet having a collar slidably mounted within the looreL of the shell and having a lower end yextending through -saicl reduced outlet and having a sliding it therein, a closure for the upper end of the shell having a bore through which the upper end of said tappet extends, said bore having an `enlargement forming a groove, Va felt washer disposed within the groove and engaging said tappet, the lower face of said tappet collar forming a downwardly directed shoulder opposing the upwardly directed shoulder ofthe shell, and a compression spring disposed intermediate p said shoulders.

In testimony whereof I hereunto afix my signature.

JOSEPH EUGENE Foss. Y 

